Safety guard for plunger machines



Jan. 26, 1932. o. D. BAYRER 1,843,077

SAFETY GUARD FOR PLUNGER MACHINES Filed June 30, 1928 4 Sheets-Sheet l Jan, 26, 1932. O, QAYRER 1,843fi7? SAFETY GUARD FOR PLUNGER MACHINES Filed June 30, 1928 Sheeis-Sheec 2 Jan. 26, 1932. o. D. BAYRER 1,343,077

SAFETY GUARD FOR PLUNGER MACHINES Filed June 30, 1928 4 Sheets-Sheet 3 Jan. 26, 1832.

C). D. BAYRER SAFETY GUARD FOR PLUNGER MACHINES Filed June 30, 1928 4 Sheets-Sheet 4 Patented Jan. 26,, 1932 UUNETEDE STATES PATENT OFFICE OR-SON BAYBER, F HARTFORD, CONNECTICUT, ASSIGNOR TO TRAVELERS INSURANCE JGOMPANY,CF-HARTFOBD, CONNECTICUT, A CORPQRATION OF CONNECTICUT SAFETY scene non PLUNGER MACHINES Application filed June 30,

, My invention relates to the class of devices that are employed to safeguard persons in the'operation, more especially,of plunger fmachines, andjan object of my invention,

among others, is the provision of a guard which the objects herein set out, as well as Y others, may be attained, is illustrated in the faccompanying drawings, in which- 715 Figure 1 is a view in side elevation of a port on of a machine equipped w th my 1m-.

proved safety guard.

Figure 2 is aview in front elevation of that portion of the machine shown in Figure .2 1 with my improved guard attached thereto.

, Figure 3 is a view, scale enlarged, on a plane denoted by thedotted line 33 of Figure 1.

Figure 4 is a view in vertical section on a plane denoted by the dotted line 4: 1 of Figure 3.

Figure: 5 is a view similar to Figure 4:, but illustrating the operation'of my improved device. I I v In the accompanying-drawings the nu- .meral 6 indicates aportion ofa frame of a plunger press in which. a plunger 7 is mountedfor reciprocating movement, said plunger having'aheadj8 at its'lower end adapted to receivea die or other suitable device. Any

- suitable means for reciprocating the plunger may be employed, thisforming no part of my present invention, and for'which reason a detailed illustration and description there- ,of are omitted herein. The numeral 9 denotes the base of the press upon which a die support 10 is located to receive a die 11, all

of'which may beef any suitable and well.

known construction. The press herein illustrated and described is particularly employed for embossing 'operations'upon stationery or similar material, although it will be understood that my invention may be well applied to any. plunger press forperforming any operation 1928. Serial No. 289,561.

any ordinary manner with the clutch mechanism for the purpose of operating it. In adapting my safety device to machines of this character I have so constructed the device that it will operate in connection with the handle 12 to operate said handle whenever the hands of an operative shall be located in a dangerous position while the plungeris descending.

My improved device comprises a guard 13 that is preferably of U-shape with an up ward extension 14 on its front portion and with the branches thereof secured to the guard supporting levers 15 pivotally attached to the outer end of guard supporting arms 16. The arms 16, one for each of the levers 15, are secured at their inner ends to a rock shaft 17 pivotally mounted in a frame 18 secured to and rising from the base or bed 9 of the machine, and as illustrated in Figure 2 of the drawings. The levers 15 are connected, if desired, by a tie rod 19 to which one.

end of a spring 20 is attached, the other end of the spring being attached to the upper cross bar of the frame 18, and as shown in Figures aand 5 of the drawings.

A clutch tripping arm 21 is secured to one end of the shaft 17 and is connected by a clutch tripping rod 22 with a trip device supported on the frame 6.

. In the structure herein shown this trip device comprises a supporting bar shown herein asconveniently, formed of a front piece 23, a back piece 24 and spacers 25 located between and near the ends of the front and back pieces to provide a space therebetween for a purpose to be hereafter described. A bracket 26 is formed on the back of the back piece 24 within which bracket a trip shaft 27 is pivotally mounted. A trip arm 28 is secured to one end of the shaft 27 and a detent 29 is secured to the other end of the shaft. This detent 29 is located, in one position, in the path of movement of a clutch actuating lever 30 pivotally supported at one end by the frame 6. Aclutch actuating spring 31 is arranged to exert its force upon the lever 30' to move it to disconnect the clutch members and thereby stop operation of the machine. Inthe arrangement-herein shown the spring ismounted upon a guide rod 32 pivotally attached atone end'to" the frame 6 and exerting its. pressure: at theiopa posite end against a thrust-piece 33=p1votally attached to the lever 30.

In operation of the machinethus far described whenever the detent 29 is disengaged from the clutch actuating lever 30 the latter, under the force of the spring 31, operates the I handle 12 to actuatethe clutch mechanism,

. therebydisengaging the'clutch members and 'pfermittingthe machine to stop it being understood that the machine is of a characterwhich stops pro'mptly'upon .the clutch membei s oe ng disengaged.

"To effect the operation of the trip me'chanism here'inbe'fore described the parts arefso arranged that movementof the, guard sup- 1 porting'levers, under certain conditions, as

* when the hand of an operative is in {a dangerous position, will rotate the roclish-aft 17 "to actuate theitrip mechanism. In efi'ecting this purpose an actuatingfinger 34 is-attached. preferably to each endof a rock shaft 35 "pivotally supported ina bracket comprismg bars 43secured to oppositesides of the plunger head 8 and projecting beyond the back side thereof; iThe' fingers 34iare adapted to engagelngs -36 projecting from the inner sur-' f faces ofthe levers 15 a spring 37 on the shaft 35 acting on the latter to hold the fingers 34 normally in position to engage said lugs. A

disengaging arm" 38 is secured to the shaft 35 preferably: at about thelengthwise center thereof, thisarm actingin connection with j a disengagingcain 39' secured to the cross bar I ofthe frame 18, to. disengage the vfingers 34 .from the lugs se t a time when danger of injury to a persons handhaspassed. Inthe I structure herein shown the arm38 for convenience has a roller40 traveling in contact 50. with said cam.-

i l In'operation, if a'persons hand41 be placed in a dangerous position and. liable to. be; struck by the plunge'rinits downward move-; ment', andas shown in Figureh of the draw- 1 ings the guard 13avhichsurrouiids the plung er will engage the handand downward move ment bfthis end ofthe guard will therefore be stopped, this downward movement having heenlcausedto'a slight extentby engagement ofthe fingers 34 with the lugs 36. 7 When the downward movement of the. outer end of the guard has thus beenstopped the action of the=fingers34-onthe lugs 36' will cause the ends of the levers opposite the guard 13 to be moved' downwa-rdly, thereby swinging ithe arms 16 to rock theshaftl'r' which-rock- 7 space.

downward movement ofthe rearward ends :of the levers 15,-, and just before the trip device is actuated to stop the machine, the fingers 34 will be disengaged from the lugs 36 and the spring- 20 will thereupon return the guard to itsupward or normal position,-after "danger to, the hand has passed as hereinbefore described. j r

In normal operation of the machine' the guard 13 will be moved downwardly at each downward movement of'th'eflplunger to a point sufiicient to close thespace between the plunger and the die 11 andienough to prevent a hand from being inserted into said Just as soon as this space is closed to this extent the fingers 34 are released from the lugs 36, in the manner hereinbefore de scribed, and-the guard 13 immediately moves to its upward position. v I r It will be understood.thatinthis latter operation of'theguard the arms 16 are held against, a stop42, as shown in'Figur'e 40f the drawings, and consequently, the ends of the levers 15 and arms 16be1ng 1n their raised positions,- the guard 13 is permitted to travel to lower'position before the fingers 34 are disengaged from the lugs 36 than in the case where the rear ends of the levers 15 and arms 7 16 are in their lowered position and as shown in Figure f the drawings. v j I The end-of the shaft 17 adjacent to the arni 21 maybe mounted in a supporting bar 44 securedto and projecting from. the base 9 and as shown in Fig. 3 of the drawings.

vlnfaccordance with the provisions of the patent statutes 1 have described the princi- .ples of operation ofmy invention, together. withthe device which I now'consider-to represent the best embodiment thereof; but I desire to "have, it understood that the device shown is onlyillustrative', andthat the invention may be vcarried outby other means and ppli out; I v "lcla-im-;y f k v '1. A safety guard mechanism including a lto uses other than thoseabove set handle for normal operation of-thestarting and stoppingmechanismof a press,- a member for-:movm'g the handle into a position to stop the press movably mountedfon the frame ,of thehpressj means for moving said member against said handle to operate the latter means for holding said member in. its normal position ofv rest, aguard movably mounted in front of thespace between the dies; of said press,-.and an operative-connection between said guard and saidgholding means to release the latter to permit operation of'said handle actuating member.

2. A safety guard mechanism including a I handle for normal operation of the starting 5 and stopping mechanism of a press, a lever forjmoving the handle into a position to stop the. press pivotallymounted on the'frame of: the'press, means for moving said lever against the. handle toroperate thelatter, a

ldetent for holding said lever in its normal position of rest, a guard movably mounted infront of the space-between the dies of said 'press and an operative connection between saidgua-rd and said detent to release the latter topermit operation of said handle actuating member.

. Asafety guard mechanism including ahandle for normal operation of the starting 1 and stopping mechanism of a press, a lever thepress pivotallymounted on the frame of the press, means for instantaneously moving said lever against said handle to operate the latter, a detent pivotally supported on said .25

frame for holding said lever in its norma position of rest, a detent, operating rod pivotally attached to said detent, a guard movably mounted in front of thespace between operating rod to operate said detent to release said lever to effect instantaneous operation of the handle actuating member.

4', A safety guard mechanism including a ping operations of a press, an operating member for said controllingmember, a guard sup porting lever mounted on the frame of the press for movement about two different pivots, a guard carried by said'lever for reciprocating movement in front of the space between the dies of said press when the lever moves about one pivot, a connection between said operating member and said guard sup. porting lever for operation of the former to.

stop the operation of the press when the lever moves about the second pivot, means carried by the press plunger to move said guard supporting lever in one direction and means for moving said lever in the opposite direction.

5; A safety guard mechanism including a member for controlling the starting and stopping operations of a press, an operating member for said controlling member, a guard supporting lever, a guard carried by said lever for reciprocating movement in front of the space between the dies of said press, pivotally mounted arm on which said guard support-.

ing lever is pivotally mounted, a connection between said pivotally mounted arm and said operating member for operation of the latter to stop the operation of the press, means carried by the press plunger to operate said arm arm in the opposite direction.

for moving the handle into a position to stop the dies of said press, and an operative connectlon between said guard and said detent member for controlling the starting and stop in one direction, and means for moving said 6. A safety guard mechanism including a member for controlling the starting and stcpping operations of a press, an operating member for said controlling member, a guard supporting lover, a guard carried by said lever for reciprocating movement in front of the space between the dies of said press, a pivotallyinounted arm on which said guard supporting lever is pivotally mounted, a rock shaft to which said arm is secured, a connection between said rock shaft and said operatmember for operation of the latter to stop the'running of the press, means carried by said press plunger to operate said rock shaft in one direction, and means for operating said shaft in the opposite direction.

'7. A safety guard mechanism including a member for controlling the starting and stoppingoperations of a press, an operating member for said controlling member, a guard supporting member movably mounted on the frame of the press, a guard carried by said supporting member for reciprocating movement in front of the space between the dies of said press, a connection between said guard supporting member and said operating member for operation ofthe latter to stop running of the press, a finger movably mounted for operation by the plunger of the press to engage said guard supporting member to move it in one direction, means for moving said guard supporting member in the opposite direction, and means for releasing said finger from said guard supporting member.

8. A safety guard mechanism including a 'member for controlling the starting and stopping operations of a press, an operating member for said controlling member, a guard supporting member movably mounted on the said finger to disengage it from said guard supporting member.

9, A safety guard mechanism including a 1 member for controlling the starting and stopping operations of a press, an operating member for said controlling member, a guard supporting member movably mounted on the frame of the press, a guard carried by said supporting member for reciprocating movement in front of the space between the dies of said press, a connection between said guard supporting member and said operating member for operation of the latter to stop the running of the press, a rock shaft carried by the press plunger, a finger secured to. "said rock shaft-to engage said guard supporting member to move. it inioneedirection, means formoving said guard supporting member in the opposite direction, and a campositioned to rock said shaftlto, disengage said finger from said 'supporting'member.

10. A safety guard mechanism including a memberfor controlling the starting and stopping operations of a press, an operating mem her for said controlling member, av guard supporting member inovably mounted on the :frame of the press, a guard carriedby said a shaft to engage said guard supporting" member to move it in one direction, means for moving said guard supporting member in the opposite direction, a disengaging arm secured to said rock shaft, and a. cam positioned to engage said arm to rock-said shaft to disengage said finger from said guard supporting member.

. '11; A safety guard mechanismincluding a member for controlling the starting and Y stopping operations of a press, an operating member for actuating said controlling mem- V guard and its support move together."

ber, a guard supporting member, amovably 'mountedsupport on which the guard sup porting member is. wholly, and movably mounted,eanoperative connection between said movably mounted support and said opcrating member, and a guard carried by said guardsupporting member for reciprocatingmovements in front of thespace between the dies. of the press.

, 12'. A safety guard mechanism including I about its second; pivot:

Age 13,077

the guard and the operating. member 'for actuatingthe latter :when the guard- 1S} moved i 14. safety guard-mechanism including a member for controlling tthei starting and stoppingoperations of a pressyan operating member-for actuating said controlling. member, a guard supported'ona stationarypon tionof the press for movement about twol'different vpivots, meansoperated by the ac'-' 'tionof the press for movingthe guard,j'said guard being normally moved i about one of itsp-i vots and beingmoved about its second pivot when an obstruction "preventssuchnon 'mal movement,;a'nd a connection between the guard and the operating member for actuating theilatter when the guard is moved about its second pivot. t r Y '15. A; safety guardmechanismincluding a member vforcontrolling the startingand i stopping operations of a press, an operating member for actuating said controlling member-,a movable guard support, a guard mounted on said support for normally moving with respect thereto, means for causing theguard" supportto move with the guard when air obstruction occurs in the-pathof movement of v the guard, a connection between amovable portion of the press and the guard for providing-motive power for the guard, and acon nection between theguard and the operating member for actuating the" latter when the (Jason 1);. BAYRER.

- a member for "controlling the starting and 1 stopping operations of a press, an operating member for actuating said controlling member, a guardsupported for movement about two different pivots, means, for normally moving the guardabout oneof said pivots,

-saidguard being movable about the second? pivot when an obstruction prevents 'ltS move-' 7 ment' aboutthe firstpivot, and a COIIDGCtlOIL betweenthe guard and the, operating member i moved about its second pivot.

for actuating" the letter when the guard-is 13. A safety guard mechanism including a member for controlling" the starting and stopping operations of a press, anoperating member for actuating said controlling memher, a guardsupported for movement about two different pivots, means operated by the action of the press for moving the guard, said guard being normally moved. about one of.

*itspivots and being moved aboutits second pivot when" an fobstruction prevents such nOrmal-Imo ement, and Va A connection between 

